mitchell



Nov. 9,1926. I 1,605,969

B. A. MITCHELL CRUSHER Filed Sept. 24, 1925 3 Sheets-Sheet 2 Nov. 91926. 1,605,969

B. A. MITCHELL CRUSHER Filed Sept. 24. 1925 3 Sheets-Sheet I} PatentedNov. 9, 1926.

UNITED STATES BENJAMIN A. MI'IGI-IELL, OF NEW YORK, N. Y.

CRUSI-IER.

Application filed September In a co-pending application for LettersPatent of the United States, Serial N 0. 520,794 filed December 8, 1921,there is shown and described and covered broadly a crusher in which therelatively movable crusher member is actuated by the centrifugal forcedeveloped by a freely movable intermediate body which has a mass centereccentric to the axis of rotation of an impeller which forms a part of arotating system, the impeller rotating upon a fixed axis, with referenceto which the movable crusher member, actuated by the centrifugal forcedeveloped by the freely movable, intermediate body, has a movement ofgyration. In another copending application'for Letters Patent of theUnited States, Serial No. 641,040, filed May 2%, 1923, there is shownand described a modification of the construction shown and described inthe earlier application, in which the shaft of the impeller is made topartake of the gyratory movement of the movable member of the crusherupon which the intermediate body acts, the aXis of the impellercoinciding at all times with the aXis of such relatively movable memberof the crusher, so that the linear velocity of the intermediate body isconstant and the undesirable results due to an alternate accelerationand re 30 tardation of such linear velocity are avoided. In thecontinued practical use of crushers constructed as shown and describedin said applications, it has been found that under some conditions ofuse furthermodifications of certain details of construction can be madewith advantage, particularly in increasing the capacity of the crusher.Such modifications are capable ofapplication to crushers constructed asshown and described in the earlier of the applications above mentionedas well as to crushers of the construction shown and described in thelater of said applications. For convenience they are illus trated hereinas applied to crushers of the construction shown in thelatter of saidapplications.

In accordance with the present invention the relatively stationarycrusher member, in stead of having a continuous mantle surface, whichlimits the discharge of material to the opening between the two crushermembers where they approach most closely to each other, is provided withopenings which may be vertical slots, as to the mantle or workingsurface, so that the crushed material may be discharged through suchopenings as well 24, 1925. Serial No. 58,227.

as through the space between the two crusher members, the width-of eachopening in the working face corresponding to the main width of the spacebetween the two crusher members where they approach each other mostclosely, converging downwardly. Also in the present modifiedconstruction means are provided for limiting positively the eX- tent ofthe gyratory movement of the relatively movable crusher member, as bythe provision of co-acting bearing rings, in place of the rubber orother cushioning means heretofore employed. In the improved crusher,also, the working parts are supported on cushions, preferably of rubber,for the purpose of reducing vibration. Other details of the improvedconstruction will be referred to hereinafter.

In the accompanying drawings, in which the invention is illustrated,Figure 1 is a view of the improved crusher in which the; right-hand halfis in elevation and the lefthand half is in vertical sectionalelevation.

Figure l? is a'detailed view on a larger scale of the universal bearingfor the rela tively movable crusher member.

Figure 2 is a view of which the right-hand portion is a top view of theconstruction shown in Figure 1 and part of the left-hand portion is ahorizontal sectional view on the plane indicated by the broken line 22of Figure 1.

Figure 3 is a view of which the right-hand half is a view in horizontalsection on the plane indicated by the upper broken line 3-3 of Figure 1and the left-hand half is a view in horizontal section on the planeindicated by the lower broken line 3-8 of Figure 1.

Figure 4 isa view in sectional elevation illustrating a modification indetails of construction to be referred to.

Figure 5 is a sectional elevation illustrating a further modification indetails of construction, the plane of section being indicated by thebroken line 5-5 of Figure 6, and Figure 6 is a top view of a portion ofthe mantle of the relatively stationary crusher member.

Figure 7 is a detail view showing both hereinafter described, issupported by a frame 16, which supports, for vertical adjustment,through threaded hooks 16 and nuts 16 a secondary frame 28, on which ismounted the casing or housing 33 of a suitable motor, preferablyelectric, which constitutes the rotor or driver of the crusher. Theshaft 40 of the rotor is connected through a universal 'joint of anyusual or suitable construction with the shaft 45 of the impeller 45,which shaft in turn is mounted near its upper end in a composite radialand thrust bearing 45 and near its lower end in a similar compositeradial and thrust bearing 45, within the relatively movable crushermember 20. The relatively movable crusher. member 20 is providedinteriorly with raceways 48, with which co-act, under the influence ofcentrifugal action, the balls or intermediate bodies or members 46,which are received in recesses in the impeller 45. It will be seen thatthe impeller, as described in the application Serial No. 641,040,gyrates with the relatively movable crusher member 20 which, in thepresent construction, is supported for gyration by a universal bearingindicated at 18, which may be of any usual or suitable construction,comprisin in the construction shown, an internal raceway or ring 18, adouble series of balls 18 and a concaved outer raceway or ring 18.

In the construction shown the coned lining or mantle 25 is supported onthe relatively movable crusher member by bolts 24 and this crushermember also supports, by bolts 20 a bearing sleeve or ring 20 to bereferred to hereinafter.

In the construction shown the upper member 16 of the relatively fixedcrusher member 15 supports by bolts 16 the lower member 16 of therelatively fixed crusher member. This lower member 16 supports themantle or lining 21 with which the mantle or lining 25 of the relativelymovable or gyratory crusher member co-acts. In the present instance thismantle 21 is shown as having a cylindrical working surface, the convering of the walls of the crushing space eing secured by the coning of themantle 25 0f the gyratory crusher member. Whereas in the constructionshown in the applications above mentioned the working surface'of themantle or lining 21 is continuous, in the present instance the mantle 21is formed with vertical slots 21' which correspond in width to the spacebetween the two mantles where they approach each other most closely,being shown in the drawing as having a width approximately equal to themaximum distance between the two mantles, where, converging downwardly,they approach each other most closely, in the gyration of the relativelymovable member. The crushed material may thus pass outwardly from theworking face of the outer crusher member and thus increase the capacityof the crusher, through the freer discharge of the crushed material fromthe crushing space. Openings 16 may be provided in the lower member 16for the delivery of the crushed material discharged through the slots21.

The lower member 16 also supports a bearing ring 16 for co-action withthe bearing ring 20 of the relatively movable crusher member, so thatthere is provided a positive means to limit the gyratory movement of therelatively movable crusher member. It will be noted that the two bearingrings are reversely tapered somewhat so as to be drawn onto thesupporting parts by the re taining bolts 20 and 16 It will be observedthat all parts of the crusher are carried by the frame member 16 and inorder to reduce vibration it has been found desirable to support theupper frame member 16, and through it the entire crusher, on yieldingpedestals 50, preferably rubber, resting on suitable beams.

T he construction indicated in Figure 4 of the drawings is substantiallylike that shown in Figures 1, 2 and 3 except that the lower frame member16 is not provided with a.

separate bearing ring, as in the construction shown in Figure 1, for coaction with the bearing ring 20 of the gyratory member, and also thatthe concave or lining 21 is indicated by dotted lines as formed insections, for facility in assembling and in reversing from time to timeto compensate for the greater w ar which comes on the lower part of themantle or lining.

The construction illustrated in Figures 5 and 6 is also generallysimilar to that shown in Figure 1 except that the mantle or lining 21,instead of being slotted all the way through from its working faceoutward, has slots 21 in its working face which communicate withvertical discharge openings 21 through which the crushed material may bedischarged through openings, indicated by broken lines in Figure 5, at25, in a flange 25 of the mantle or lining 25".

Obviously the openings might be formed in. the working faces of bothcrusher members and might be other than slots, as shown at 21 and 25 inFigure 7.

It will be understood that various changes in details of constructionand design can be made to suit different conditions of use and that,except as pointed out in the accompanying claims, the invention is notrestricted to the particular construction shown and described herein.

I claim as my invention:

1. In a crusher, the combination of a relatively fixed crusher member, afreely gyratory crusher member actuating means coaxial with the gyratorycrusher member, and

reoaeee positive means independent of the actuating means to limit theextent of the gyratory movement of the gyratory member with respect tothe relatively fixed member.

2. In a crusher, the combination. of a relatively fixed crusher member,a freely gyratory crusher member and actuating means coaxial with thegyratory crusher member, said members having co-acting bearing surfacesindependent of the actuating means to limit the gyratory movement of thegyratory member with respect to the relatively fixed member.

3. In a crusher, the combination of a relatively fixed crusher member, afreely gyratory crusher member actuating means coaxial with the gyratorycrusher member, and bearing rings carried by said members, respectively,and independent of the actuating means to limit positively the gyratorymovement of the gyratory member with respect to the relatively fixedmember.

at. In a crusher, the combination of a relatively fixed crusher member,a relatively movable crusher member, a balanced impeller, a freelymovable intermediate body interposed between the impeller and the relatively movable crusher member and subject to the action of centrifugalforce, and means to limit positively the gyratory movement of themovable crusher member with respect to the fixed crusher member.

In a crusher, the combination of a relatively fixed crusher, a freelygyratory crusher member, actuating means therefor, one of said crushermembers having openings formed in its working face to permit thedischarge of crushed material therethrough and means carried with one ofthe crusher members for diverting the material passing through suchopenings into the path of that passing between the crusher members.

6. In a crusher, the combination of a relatively fixed crusher member, arelatively movable crusher member, the one of said members beingsupported by the other, and cushion supports for the supporting member,whereby the vibrations of the crusher are cushioned.

7. In a crusher, the combination of a relatively fixed crusher memberhaving a supporting frame, cushioned pedestals to support said frame anda gyratory crusher membor supported by the relatively fixed member,whereby the vibrations of the crusher are cushioned.

8. In a crusher, the combination of a relatively fixed crusher memberhaving a supporting frame member, a gyratory crusher member, a secondaryframe member in which the gyratory member is supported and threadedhooked bolts with nuts supported by the fixed frame member and engagingthe secondary frame member to support the same with capacity forvertical adjustment.

9. In a crusher, the combination of a relatively fixed crusher member, arelatively movable crusher member, an impeller, a freely movableintermediate body interposed between the impeller and the relativelymovable crusher member and subject to the ac tion of centrifugal force,and means to limit positively the gyratory movement of the movablecrusher member with respect to the fixed crusher member.

This specification signed this 19th day of September A. I). 1925.

BENJAMIN A. MITCHELL.

